Taper roller bearings size:30,31,32,33series class of precision:ABEC-1 Hardness:59 ... bearingsproduct detail description: Prducts nametaper roller bearingBrand nameF-ISeries 30,31,32,33 seriesID size5 mm - 350 mmCage materialSteel , brass , Iron , plasticPrecision ... termsA:100% L/C at sightB: 30% T/T in advance .70% against copy of B/LWestern UnionApplicationMining. Metallurgy. Agriculture. Chemical. ...